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The response of the upper ocean to tropical cyclone Viyaru over the Bay of Bengal 预览
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作者 Mir Kashem Md Kawser Ahmed +2 位作者 Fangli Qiao M A E Akhter K M Azam Chowdhury 《海洋学报:英文版》 SCIE CAS CSCD 2019年第1期61-70,共10页
Better forecast of tropical cyclone (TC) can help to reduce risk and enhance management. The TC forecast depends on the scientific understanding of oceanic processes, air-sea interaction and finally, the atmospheric p... Better forecast of tropical cyclone (TC) can help to reduce risk and enhance management. The TC forecast depends on the scientific understanding of oceanic processes, air-sea interaction and finally, the atmospheric process. The TC Viyaru is taken as an example, which is formed at the end of 11 May 2013 and sustains up to 17 May 2013 during pre-monsoon season. Argo data are used to investigate ocean response processes by comparing pre- and post-conditions of the TC. Eight oceanic parameters including the sea surface temperature (SST), the sea surface salinity (SSS), and the barrier layer thickness (BLT), the 26℃ isotherm depth in the ocean (D26), the isothermal layer depth (ILD), the mixed layer depth (MLD), the tropical cyclone heat potential (TCHP) and the effective oceanic layer for cyclogenesis (EOLC) are chosen to evaluate the pre- and post-conditions of the TC along the track of Viyaru. The values of the SST, D26, BLT, TCHP and EOLC in the pre-cyclonic condition are higher than the post-cyclonic condition, while the SSS, ILD and MLD in the post-cyclonic condition are higher than the pre-cyclonic condition of the ocean due to strong cyclonic winds and subsurface upwelling. It is interesting that the strong intensity of the TC reduces less SST and vice versa. The satisfied real time Argo data is not available in the northern Bay of Bengal especially in the coastal region. A weather research and forecasting model is employed to hindcast the track of Viyaru, and the satellite data from the National Center Environmental Prediction are used to assess the hindcast. 展开更多
关键词 effective OCEANIC layer for cyclogenesis sea surface temperature TROPICAL CYCLONE TROPICAL CYCLONE heat potential TROPICAL CYCLONE viyaru WEATHER research and forecasting model
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IDEALIZED SIMULATIONS OF THE INNER CORE BOUNDARY LAYER STRUCTURE IN A LANDFALLING TROPICAL CYCLONE. PART Ⅰ: KINEMATIC STRUCTURE
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作者 GABRIEL J.WILLIAMS JR. 《热带气旋研究与评论(英文版)》 2019年第2期53-73,共21页
The effects of coastal topography and coastal location in the distribution of boundary layer winds in the inner core of mature tropical cyclones are examined using a high-resolution multi-level model. In these numeric... The effects of coastal topography and coastal location in the distribution of boundary layer winds in the inner core of mature tropical cyclones are examined using a high-resolution multi-level model. In these numerical simulations, the evolution of the tropical cyclone boundary layer(TCBL) is studied in storm-relative coordinates, and in lieu of an actual steering current moving the model vortex, the position of the land-sea interface was shifted through the grid domain at a constant speed with separate surface boundary conditions specified over the land and ocean areas. It is shown that the presence of a coastal boundary produces land-induced asymmetries(along with an internal boundary layer) due to the asymmetric structure of surface drag. This land-induced asymmetry is found in both the azimuthal and radial wind field at landfall. For a moving storm, nonlinear advective interactions between storm-induced asymmetries and land-induced asymmetries can generate a lowlevel vorticity band ahead of the hurricane. When the storm motion vector has a component that is perpendicular to the coastal boundary, the interaction between this band and the mean vortex leads to a temporary weakening and re-intensification cycle. Furthermore, it is shown that the relative magnitude of the land-induced asymmetry depends upon the terrain slope and the terrain height such that the land-induced asymmetry dominates over the motion-induced asymmetry for elevated terrain. These results underscore the specific differences in boundary layer evolution and intensity evolution for hurricanes interacting with complex topographical features. 展开更多
关键词 HURRICANE TROPICAL CYCLONE landfalling HURRICANE TROPICAL CYCLONE BOUNDARY layer
地面三维激光扫描技术在建筑物立面测绘中的应用 预览
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作者 胡玉祥 李勇 +2 位作者 张洪德 王智 孟庆年 《城市勘测》 2019年第3期87-91,共5页
针对传统建筑物立面测绘“时间长”“难测绘”“可视化差”等缺点,结合三维激光扫描技术,本文探讨使用徕卡公司最新研制的高精度站式扫描仪P40进行建筑物信息采集,利用专业点云后处理软件Cyclone经过坐标转换、点云拼接、点云优化、点... 针对传统建筑物立面测绘“时间长”“难测绘”“可视化差”等缺点,结合三维激光扫描技术,本文探讨使用徕卡公司最新研制的高精度站式扫描仪P40进行建筑物信息采集,利用专业点云后处理软件Cyclone经过坐标转换、点云拼接、点云优化、点云去噪等操作,最终采用AutoCAD插件CloudWorx提取建筑物特征点,生成建筑物立面图。通过对比全站仪测量数据,对P40点云数据提取建筑物轮廓点、线进行精度验证。结果表明,通过P40扫描点云提取建筑物特征点、线中误差在2cm左右,完全可以满足建筑物立面测绘要求。 展开更多
关键词 三维激光扫描技术 徕卡P40 CYCLONE CloudWorx 立面测绘 精度验证
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静电喷雾旋风除尘器荷电特性及细颗粒物的脱除
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作者 王军锋 张姚文 孟令鹏 《高电压技术》 EI CAS CSCD 北大核心 2019年第2期637-642,共6页
为寻求细颗粒物的高效脱除方法,设计了一种静电喷雾旋风分离装置,对液滴的荷电特性以及装置的降尘率进行了实验研究。同时分别测定了荷电电压、极间距、电极圆环半径对液滴荷质比、电场强度、粉尘浓度以及喷雾流量等参数对降尘率的影响... 为寻求细颗粒物的高效脱除方法,设计了一种静电喷雾旋风分离装置,对液滴的荷电特性以及装置的降尘率进行了实验研究。同时分别测定了荷电电压、极间距、电极圆环半径对液滴荷质比、电场强度、粉尘浓度以及喷雾流量等参数对降尘率的影响规律。实验结果表明:随着荷电电压的增加,液滴荷质比先增大后减小;同等电压工况下液滴荷质比随电极圆环半径的增加而减小,随极间距的增加而增大;装置降尘率随电场强度的增加最高可提升至88.5%;未荷电工况下,装置降尘率随粉尘浓度减小而降低,荷电后,降尘率保持在较高范围内;当电场强度相同,喷雾流量为540 mL/min时降尘率达到最佳。研究结果为开发高细颗粒物补集效率的新型旋风除尘器奠定了实验基础。 展开更多
关键词 静电喷雾 荷质比 电场强度 喷雾流量 旋风除尘器
二次分离型旋风筒性能的研究与优化 预览
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作者 宋凯凯 王洋洋 李昌勇 《硅酸盐通报》 CAS 北大核心 2019年第2期371-374,共4页
通过冷模实验分析了二次分离装置对旋风筒性能的影响,并探讨了不同内筒直径下二次分离型旋风筒的压降和分离效率变化规律。结果表明:气流在进入内筒时的切向速度仍接近最大值,说明内筒中的气流仍保持着较大的旋流强度,在内筒上进行二次... 通过冷模实验分析了二次分离装置对旋风筒性能的影响,并探讨了不同内筒直径下二次分离型旋风筒的压降和分离效率变化规律。结果表明:气流在进入内筒时的切向速度仍接近最大值,说明内筒中的气流仍保持着较大的旋流强度,在内筒上进行二次分离改装是合理的;二次分离改装后的旋风筒分离效率为97. 67%,提高了2. 3%,且压降降低了400 Pa;二次分离口在Turn0°时的压降最小。 展开更多
关键词 旋风筒 二次分离 压降 分离效率 流场
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承德市一次由快速发展气旋诱发的大风天气分析 预览
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作者 冯钰博 王宏 +1 位作者 杨梅 高艳春 《沙漠与绿洲气象》 2019年第2期84-89,共6页
利用常规观测资料和NCEP/NCAR(1°×1°)逐6h再分析资料,对承德市2017年5月5—6日大风天气的环流形势和物理量进行分析,结果表明气旋的快速发展(气旋加深率0.84B)导致锋生加强,引发气压和变压梯度加大是导致大风的直接原因... 利用常规观测资料和NCEP/NCAR(1°×1°)逐6h再分析资料,对承德市2017年5月5—6日大风天气的环流形势和物理量进行分析,结果表明气旋的快速发展(气旋加深率0.84B)导致锋生加强,引发气压和变压梯度加大是导致大风的直接原因。500hPa高压脊东移迫使冷空气向南堆积,高空槽不断发展成为冷涡,温度平流为地面气旋的发展提供热力条件,高低层涡度平流的差异,也是地面气旋快速发展的重要原因;当1.5PVU位涡面伸展至对流层低层时,局地位涡异常在气旋的发展过程中不可忽视;高空急流出口区发生质量调整,出口区左侧的辐散强度达10×10^-5s^-1,使低层大气减压,有利于气旋发展。 展开更多
关键词 大风 气旋 温度平流 涡度平流 位涡
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某浮选尾煤脱泥后可浮性试验研究 预览
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作者 任瑞晨 赵靖雨 +3 位作者 郑忠宇 孙得智 程贵彬 董庆国 《煤炭转化》 CAS CSCD 北大核心 2019年第5期82-87,共6页
采用Ф25 mm小锥角水力旋流器对煤泥进行预先脱泥,通过顺序评价试验对旋流器脱泥前后煤泥进行可浮性评定。结果表明:煤泥脱泥前,当精煤灰分定为12%时,精煤产率为13.68%,可燃体回收率为17.94%,可浮性为极难选;经过Ф25 mm水力旋流器脱泥... 采用Ф25 mm小锥角水力旋流器对煤泥进行预先脱泥,通过顺序评价试验对旋流器脱泥前后煤泥进行可浮性评定。结果表明:煤泥脱泥前,当精煤灰分定为12%时,精煤产率为13.68%,可燃体回收率为17.94%,可浮性为极难选;经过Ф25 mm水力旋流器脱泥后,底流合格精煤产率为36.47%,可燃体回收率为42.44%,可浮性为难选。顺序评价试验结果表明,各产品灰分均减小,说明旋流器预先脱泥对后续浮选有效,煤泥可浮性得到有效改善。 展开更多
关键词 浮选尾煤 旋流器 脱泥 灰分 可浮性
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INTELLIGENT ALGORITHMS FOR SOLVING CNOP AND THEIR APPLICATIONS IN ENSO PREDICTABILITY AND TROPICAL CYCLONE ADAPTIVE OBSERVATIONS
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作者 穆斌 张琳琳 +4 位作者 袁时金 钱一闻 温仕成 颜景豪 周菲凡 《热带气象学报:英文版》 SCIE 2019年第1期63-81,共19页
Some intelligent algorithms(IAs)proposed by us,including swarm IAs and single individual IAs,have been applied to the Zebiak-Cane(ZC)model to solve conditional nonlinear optimal perturbation(CNOP)for studying El Ni?o-... Some intelligent algorithms(IAs)proposed by us,including swarm IAs and single individual IAs,have been applied to the Zebiak-Cane(ZC)model to solve conditional nonlinear optimal perturbation(CNOP)for studying El Ni?o-Southern Oscillation(ENSO)predictability.Compared to the adjoint-based method(the ADJ-method),which is referred to as a benchmark,these IAs can achieve approximate CNOP results in terms of magnitudes and patterns.Using IAs to solve CNOP can avoid the use of an adjoint model and widen the application of CNOP in numerical climate and weather modeling.Of the proposed swarm IAs,PCA-based particle swarm optimization(PPSO)obtains CNOPs with the best patterns and the best stability.Of the proposed single individual IAs,continuous tabu search algorithm with sine maps and staged strategy(CTS-SS)has the highest efficiency.In this paper,we compare the validity,stability and efficiency of parallel PPSO and CTS-SS using these two IAs to solve CNOP in the ZC model for studying ENSO predictability.The experimental results show that CTS-SS outperforms parallel PPSO except with respect to stability.At the same time,we are also concerned with whether these two IAs can effectively solve CNOP when applied to more complicated models.Taking the sensitive areas identification of tropical cyclone adaptive observations as an example and using the fifth-generation mesoscale model(MM5),we design some experiments.The experimental results demonstrate that each of these two IAs can effectively solve CNOP and that parallel PPSO has a higher efficiency than CTS-SS.We also provide some suggestions on how to choose a suitable IA to solve CNOP for different models. 展开更多
关键词 CNOP single individual INTELLIGENT ALGORITHMS swarm INTELLIGENT ALGORITHMS ENSO PREDICTABILITY tropical cyclone adaptive observations
140t/h循环流化床锅炉低氮燃烧改造与运行 预览
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作者 于洁 于理 +2 位作者 武文珏 徐林林 孙路石 《能源研究与管理》 2019年第1期109-112,共4页
对1台140t/h高温高压循环流化床锅炉的二次风和分离器入口进行了改造。通过提高二次风的分级比并且增加分离器分离效率,从而起到强化分级燃烧、降低炉温的效果,最终达到了氮氧化物50%的降幅,表明了良好的降氮改造效果。
关键词 循环流化床 NOx 二次风改造 分离器
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秸秆炭化热解气旋风分离器-指杆轮两级净化装置研制 预览
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作者 辛明金 迟博文 +5 位作者 陈天佑 孟军 焦晋康 颚洋 邬立岩 宋玉秋 《农业工程学报》 EI CAS CSCD 北大核心 2019年第4期218-224,共7页
为提高秸秆热解气的净化率,防止装置堵塞,该研究设计了旋风分离器与回转指杆轮相结合的两级净化装置,Ⅰ级旋风分离器主要分离热解气中大粒径杂质,Ⅱ级指杆轮使小粒径灰尘、焦油等杂质与锥形指杆碰撞、聚集、并在高速回转作用下离心分离... 为提高秸秆热解气的净化率,防止装置堵塞,该研究设计了旋风分离器与回转指杆轮相结合的两级净化装置,Ⅰ级旋风分离器主要分离热解气中大粒径杂质,Ⅱ级指杆轮使小粒径灰尘、焦油等杂质与锥形指杆碰撞、聚集、并在高速回转作用下离心分离,实现热解气高效净化。研究确定了Ⅰ级净化装置的结构参数,设计了Ⅱ级净化装置,确定了指杆轮与锥形指杆的参数及排列方式。以指杆轮转速、热解气的进口速度和芯筒入筒体深度为影响因素,以热解气的净化率和压力损失为指标,进行了二次通用旋转组合样机性能试验。利用Design-Expert8.0.6软件对试验数据进行方差和响应面分析,建立了影响因素与指标之间的数学模型,采用多指标优化法确定最优组合并进行了试验验证。试验得到最优组合参数:指杆轮转速为3030r/min,进口速度为19.5m/s,芯筒入筒体深度为210mm,此时的压力损失为1971.73Pa,热解气总净化率为84.2%,达到了净化要求。研究结果可为秸秆热解气净化装置研究提供理论依据。 展开更多
关键词 秸秆 炭化 净化 热解气 两级净化 旋风分离器 指杆轮 压力损失
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Sea-Salt Aerosol Effects on the Simulated Microphysics and Precipitation in a Tropical Cyclone
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作者 Baolin JIANG Wenshi LIN +1 位作者 Fangzhou LI Junwen CHEN 《气象学报:英文版》 SCIE CSCD 2019年第1期115-125,共11页
We investigate the effects of sea-salt aerosol(SSA) activated as cloud condensation nuclei on the microphysical processes, precipitation, and thermodynamics of a tropical cyclone(TC). The Weather Research and Forecast... We investigate the effects of sea-salt aerosol(SSA) activated as cloud condensation nuclei on the microphysical processes, precipitation, and thermodynamics of a tropical cyclone(TC). The Weather Research and Forecasting model coupled with Chemistry(WRF-Chem) was used together with a parameterization of SSA production. Three simulations, with different levels of SSA emission(CTL, LOW, HIGH), were conducted. The simulation results show that SSA contributes to the processes of autoconversion of cloud water and accretion of cloud water by rain,thereby promoting rain formation. The latent heat release increases with SSA emission, slightly increasing horizontal wind speeds of the TC. The presence of SSA also regulates the thermodynamic structure and precipitation of the TC.In the HIGH simulation, higher latent heat release gives rise to stronger updrafts in the TC eyewall area, leading to enhanced precipitation. In the LOW simulation, due to decreased latent heat release, the temperature in the TC eye is lower, enhancing the downdrafts in the region;and because of conservation of mass, updrafts in the eyewall also strengthen slightly;as a result, precipitation in the LOW experiment is a little higher than that in the CTL experiment.Overall, the relationship between the precipitation rate and SSA emission is nonlinear. 展开更多
关键词 SEA-SALT aerosol MICROPHYSICS tropical CYCLONE WRF-Chem cloud CONDENSATION NUCLEI
Importance of identifying tropical cyclone tornadoes in typhoon warning and defense systems
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作者 Dan Yao Xudong Liang +5 位作者 Qing Meng Jian Li Chong Wu Zhengshuai Xie Dandan Chen Jianping Guo 《科学通报:英文版》 SCIE EI CSCD 2019年第3期143-145,共3页
Tornadoes are highly localized severe weather phenomena and have been of increasing concern in China [1] in recent years, especially after the sinking of the Oriental Star in 2015 [2] and severe tornado damage in Yanc... Tornadoes are highly localized severe weather phenomena and have been of increasing concern in China [1] in recent years, especially after the sinking of the Oriental Star in 2015 [2] and severe tornado damage in Yancheng in 2016 (3)Tornadoes induced by tropical cyclones, however, have received little attention.A recent study has shown that a large number of tornado-scale vortices can be produced at the inner edge of the intense eyewallconvection of tropical cyclones [4]. 展开更多
关键词 TROPICAL CYCLONE DEFENSE systems UAV LST
Ibese熟料生产线提高预热器旋风筒分离效率的技术改造 预览
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作者 黄巧丽 《水泥工程》 CAS 2019年第3期11-12,17共3页
针对非洲Ibese水泥熟料生产线出现的窑系统热耗、料耗、烧成电耗偏高,预热器飞灰量大,分离效率低等问题,以低投入、高产出的改造原则,通过对旋风筒进行局部改造,提高其分离效率,进一步提高熟料产量,降低单位熟料热耗和电耗.
关键词 生料粒径 旋风筒 分离效率 飞灰量 节能降耗
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水厂铁矿尾矿干排工艺技术创新与应用 预览
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作者 秦兰 《现代矿业》 CAS 2019年第2期120-124,共5页
水厂铁矿尾矿处理工艺系统落后,受季节因素、尾矿库使用年限制约,严重影响生产正常运行。为减少尾矿入库量,延长尾矿库使用年限,通过对国内众多矿山尾矿干排工艺考察分析,结合水厂铁矿生产实际,提出尾矿干排工艺改造,对尾矿干排工艺设... 水厂铁矿尾矿处理工艺系统落后,受季节因素、尾矿库使用年限制约,严重影响生产正常运行。为减少尾矿入库量,延长尾矿库使用年限,通过对国内众多矿山尾矿干排工艺考察分析,结合水厂铁矿生产实际,提出尾矿干排工艺改造,对尾矿干排工艺设计进行创新研究,采用“旋流器+直线筛”尾砂干排技术,依托地形特点,创造性实施了阶梯式分散布置方式,打破了集中布置、皮带传送的常规生产线设计模式,大幅度提高干排砂存储空间,冬季也能正常生产,减少了工程投资和生产运营成本。项目实施后,生产干排砂物料用于采坑回填和土地整备治理等综合应用,从源头节约资源,降低污染,推动尾矿资源综合利用的发展,保护矿山环境,建设绿色矿山。 展开更多
关键词 尾矿干排 旋流器 脱水直线筛 高效浓缩 喂料方式 综合利用
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CAS FGOALS-f3-L Model Datasets for CMIP6 Historical Atmospheric Model Intercomparison Project Simulation 预览
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作者 Bian HE Qing BAO +14 位作者 Xiaocong WANG Linjiong ZHOU Xiaofei WU Yimin LIU Guoxiong WU Kangjun CHEN Sicheng HE Wenting HU Jiandong LI Jinxiao LI Guokui NIAN Lei WANG Jing YANG Minghua ZHANG Xiaoqi ZHANG 《大气科学进展:英文版》 SCIE CAS CSCD 2019年第8期771-778,共8页
The outputs of the Chinese Academy of Sciences(CAS) Flexible Global Ocean–Atmosphere–Land System(FGOALS-f3-L) model for the baseline experiment of the Atmospheric Model Intercomparison Project simulation in the Diag... The outputs of the Chinese Academy of Sciences(CAS) Flexible Global Ocean–Atmosphere–Land System(FGOALS-f3-L) model for the baseline experiment of the Atmospheric Model Intercomparison Project simulation in the Diagnostic,Evaluation and Characterization of Klima common experiments of phase 6 of the Coupled Model Intercomparison Project(CMIP6) are described in this paper. The CAS FGOALS-f3-L model, experiment settings, and outputs are all given. In total,there are three ensemble experiments over the period 1979–2014, which are performed with different initial states. The model outputs contain a total of 37 variables and include the required three-hourly mean, six-hourly transient, daily and monthly mean datasets. The baseline performances of the model are validated at different time scales. The preliminary evaluation suggests that the CAS FGOALS-f3-L model can capture the basic patterns of atmospheric circulation and precipitation well, including the propagation of the Madden–Julian Oscillation, activities of tropical cyclones, and the characterization of extreme precipitation. These datasets contribute to the benchmark of current model behaviors for the desired continuity of CMIP. 展开更多
关键词 CMIP6 AMIP FGOALS-f3-L MJO tropical CYCLONE extreme precipitation
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气携式涡旋絮凝反应器数值模拟
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作者 祝威 王志新 +3 位作者 韩霞 闫小康 谷梅霞 李小兵 《中国矿业大学学报》 EI CAS CSCD 北大核心 2019年第4期911-918,共8页
采用计算流体力学软件Fluent对气携式涡旋絮凝反应器(GVFR)内部流场进行了气-液两相流数值模拟,研究了GVFR内不同区域流场分布特征,分析了不同流场中絮凝作用,并用GVFR反应装置与搅拌絮凝装置分别对油田压裂返排液进行处理.结果表明:从... 采用计算流体力学软件Fluent对气携式涡旋絮凝反应器(GVFR)内部流场进行了气-液两相流数值模拟,研究了GVFR内不同区域流场分布特征,分析了不同流场中絮凝作用,并用GVFR反应装置与搅拌絮凝装置分别对油田压裂返排液进行处理.结果表明:从旋流絮凝反应区到涡流絮凝反应区,流体形态依次为"旋流-涡流-塞流".在旋流絮凝反应区,气、液两相以切向运动为主,最大切向速度为225.6 mm/s,切向速度梯度使小絮体、颗粒间快速碰撞,形成体积较大、密实较低的絮体;在小涡流絮凝反应区内径向速度由0递增到49.1 mm/s,径向速度梯度强化了絮凝反应,使大而疏松絮体破碎,并在微泡作用下重新接触絮凝形成密实絮体;大涡流絮凝反应区内相对稳定的塞流使絮体进一步接触絮凝,并推动絮凝作整体运动.采用GVFR对油田压裂废液进行预处理,出水含油量和悬浮物的质量浓度均低于50 mg/L. 展开更多
关键词 气携式涡旋絮凝反应器 数值模拟 旋流 涡流 絮凝
一种利用旋流器改进尾矿取样的方法
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作者 何永苍 赵锋先 《磷肥与复肥》 CAS 2019年第4期49-50,共2页
甘肃瓮福化工有限责任有限公司120万t/a磷矿浮选装置尾矿磷含量测定值不准确,对装置改造升级造成影响。分析磷矿浮选装置磷尾矿浆取样代表性不强的原因,采取利用旋流器将固相物分离后再进行取样的方法。结果表明,取样方法改进后,检测结... 甘肃瓮福化工有限责任有限公司120万t/a磷矿浮选装置尾矿磷含量测定值不准确,对装置改造升级造成影响。分析磷矿浮选装置磷尾矿浆取样代表性不强的原因,采取利用旋流器将固相物分离后再进行取样的方法。结果表明,取样方法改进后,检测结果能反映磷尾矿的真实磷含量,较好地解决了问题。 展开更多
关键词 磷矿浮选装置 尾矿取样 旋流器
Climatology of Energetics of Cyclones over Indian Seas 预览
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作者 Somenath Dutta Geena Sandhu +1 位作者 Sanjay G Narkhedkar Sunitha Devi 《大气科学研究(英文)》 2019年第1期1-9,共9页
An attempt has been made to bring out a climatology of the energetics associated with the tropical cyclones formed over North Indian Seas, viz., the Arabian Sea (AS) and the Bay of Bengal (BOB). Study period is from 1... An attempt has been made to bring out a climatology of the energetics associated with the tropical cyclones formed over North Indian Seas, viz., the Arabian Sea (AS) and the Bay of Bengal (BOB). Study period is from 1991 to 2013. During this period a total 88 cyclones that developed over the Indian Seas have been considered. These intense systems are categorized on the basis of their formation region and season of formation. It is seen that during the study period, the frequency of formation of cyclones over BOB is twice that over AS which is consistent with the climatology of the regions. Further, it is noticed that over both the regions, they are more frequently formed in the post monsoon period compared to pre monsoon. The trend analysis of the frequency of cyclones forming over both basins, season wise shows that the overall trend for both basins is of just decreasing type. However, for Arabian Sea;the decreasing trend is more apparent in the post monsoon season, whereas in the case of the Bay of Bengal the decreasing trend is more evident in the pre-monsoon season. Various energy terms, their generation and conversion terms have been computed using NCEP/NCAR reanalysis data. Day to day quantitative analysis of these parameters is studied critically during various stages of the cyclones. The composites of these categorized systems are formed and studied. The formative, intensification and dissipation stages showed variations in their energy terms. 展开更多
关键词 CYCLONE CLIMATOLOGY ENERGETICS
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旋风式清堵技术在焦化筒仓的应用 预览
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作者 熊燕 崔少华 汪涛 《安徽冶金科技职业学院学报》 2019年第1期64-65,共2页
采用旋风清堵装置,首次应用焦化筒仓清堵,根据我厂煤种粘性不同,助流风管和喷嘴采用三种形式布置,可在短的时间内,实现多次通、断气,出现多个冲量高峰,使仓内物料产生脉动振荡,在南方雨季,对难卸煤以及粘性较大的煤种有很好下煤作用。
关键词 旋风式 焦化筒仓 清堵
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弧形溢流管对旋流器分离性能的影响 预览
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作者 胥聪聪 张悦刊 +2 位作者 刘培坤 杨兴华 姜兰越 《金属矿山》 CAS 北大核心 2019年第5期142-146,共5页
针对目前运行的旋流器存在短路流导致溢流跑粗的问题,提出了一种弧形溢流管旋流器,并进行了数值模拟和试验研究。模拟结果表明,利用溢流管的弧形结构将溢流口底端的过渡区域外移,实现过渡区域流体切线速度的提升,从而增加离心强度,将短... 针对目前运行的旋流器存在短路流导致溢流跑粗的问题,提出了一种弧形溢流管旋流器,并进行了数值模拟和试验研究。模拟结果表明,利用溢流管的弧形结构将溢流口底端的过渡区域外移,实现过渡区域流体切线速度的提升,从而增加离心强度,将短路流引导至外旋流重新参与分离,达到抑制溢流跑粗的效果。试验结果表明,相同排口比下,弧形溢流管旋流器溢流-25μm粒级含量和综合分级效率均高于直线形溢流管旋流器;试验用弧形溢流管旋流器在排口比为0.33时抑制旋流器溢流跑粗的效果最好,对应的溢流浓度为4.72%,溢流-25μm粒级含量为98.37%,-25μm计的综合分级效率为78.92%,高于直线形溢流管旋流器对应情况下的4.25%、96.86%和73.51%。 展开更多
关键词 旋流器 短路流 弧形溢流管 综合分级效率
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